<template>
    <div class="player" v-show="playlist.length>0">
        <transition name="normal" @enter="enter" @after-enter="afterEnter" @leave="leave" @after-leave="afterLeave">
            <div class="normal-player" v-show="fullScreen">
                <div class="background">
                    <img width="100%" height="100%" :src="currentSong.image">
                </div>
                <div class="top">
                    <div class="back" @click="back">
                        <i class="icon-back"></i>
                    </div>
                    <h1 class="title" v-html="currentSong.name"></h1>
                    <h2 class="subtitle" v-html="currentSong.singer"></h2>
                </div>
                <div class="middle" @touchstart.prevent="middleTouchStart" @touchmove.prevent="middleTouchMove" @touchend="middleTouchEnd">
                    <div class="middle-l" ref="middleL">
                        <div class="cd-wrapper" ref="cdWrapper">
                            <div class="cd" :class="cdCls">
                                <img class="image" :src="currentSong.image">
                            </div>
                        </div>
                        <div class="playing-lyric-wrapper">
                            <div class="playing-lyric">{{playingLyric}}</div>
                        </div>
                    </div>
                    <scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
                        <div class="lyric-wrapper">
                            <div v-if="currentLyric">
                                <p ref="lyricLine" class="text" :class="{'current': currentLineNum ===index}" v-for="(line,index) in currentLyric.lines">{{line.txt}}</p>
                            </div>
                        </div>
                    </scroll>
                </div>
                <div class="bottom">
                    <div class="dot-wrapper">
                        <span class="dot" :class="{'active':currentShow==='cd'}"></span>
                        <span class="dot" :class="{'active':currentShow==='lyric'}"></span>
                    </div>
                    <div class="progress-wrapper">
                        <span class="time time-l">{{format(currentTime)}}</span>
                        <div class="progress-bar-wrapper">
                            <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
                        </div>
                        <span class="time time-r">{{format(currentSong.duration)}}</span>
                    </div>
                    <div class="operators">
                        <div class="icon i-left" @click="changeMode">
                            <i :class="iconMode"></i>
                        </div>
                        <div class="icon i-left" :class="disableCls">
                            <i @click="prev" class="icon-prev"></i>
                        </div>
                        <div class="icon i-center" :class="disableCls">
                            <i @click="togglePlaying" :class="playIcon"></i>
                        </div>
                        <div class="icon i-right" :class="disableCls">
                            <i @click="next" class="icon-next"></i>
                        </div>
                        <div class="icon i-right">
                            <i @click="toggleFavorite(currentSong)" class="icon" :class="getFavoriteIcon(currentSong)"></i>
                        </div>
                    </div>
                </div>
            </div>
        </transition>
        <transition name="mini">
            <div class="mini-player" v-show="!fullScreen" @click="open">
                <div class="icon">
                    <img :class="cdCls" width="40" height="40" :src="currentSong.image">
                </div>
                <div class="text">
                    <h2 class="name" v-html="currentSong.name"></h2>
                    <p class="desc" v-html="currentSong.singer"></p>
                </div>
                <div class="control">
                    <progress-circle :radius="radius" :percent="percent">
                        <i @click.stop="togglePlaying" class="icon-mini" :class="miniIcon"></i>
                    </progress-circle>
                </div>
                <div class="control" @click.stop="showPlaylist">
                    <i class="icon-playlist"></i>
                </div>
            </div>
        </transition>
        <playlist ref="playlist"></playlist>
        <audio ref="audio" :src="currentSong.url" @play="ready" @error="error" @timeupdate="updateTime" @ended="end"></audio>
    </div>
</template>

<script type="text/ecmascript-6">
import { mapGetters, mapMutations, mapActions } from 'vuex'
import animations from 'create-keyframe-animation'
import { prefixStyle } from 'common/js/dom'
import ProgressBar from 'base/progress-bar/progress-bar'
import ProgressCircle from 'base/progress-circle/progress-circle'
import { playMode } from 'common/js/config'
import Lyric from 'lyric-parser'
import Scroll from 'base/scroll/scroll'
import { playerMixin } from 'common/js/mixin'
import Playlist from 'components/playlist/playlist'

const transform = prefixStyle('transform')
const transitionDuration = prefixStyle('transitionDuration')

export default {
    mixins: [playerMixin],
    data() {
        return {
            songReady: false,
            currentTime: 0,
            radius: 32,
            currentLyric: null,
            currentLineNum: 0,
            currentShow: 'cd',
            playingLyric: ''
        }
    },
    computed: {
        cdCls() {
            return this.playing ? 'play' : 'play pause'
        },
        playIcon() {
            return this.playing ? 'icon-pause' : 'icon-play'
        },
        miniIcon() {
            return this.playing ? 'icon-pause-mini' : 'icon-play-mini'
        },
        disableCls() {
            return this.songReady ? '' : 'disable'
        },
        percent() {
            return this.currentTime / this.currentSong.duration
        },
        ...mapGetters([
            'currentIndex',
            'fullScreen',
            'playing'
        ])
    },
    created() {
        this.touch = {}
    },
    methods: {
        back() {
            this.setFullScreen(false)
        },
        open() {
            this.setFullScreen(true)
        },
        enter(el, done) {
            const { x, y, scale } = this._getPosAndScale()

            let animation = {
                0: {
                    transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
                },
                60: {
                    transform: `translate3d(0,0,0) scale(1.1)`
                },
                100: {
                    transform: `translate3d(0,0,0) scale(1)`
                }
            }

            animations.registerAnimation({
                name: 'move',
                animation,
                presets: {
                    duration: 400,
                    easing: 'linear'
                }
            })

            animations.runAnimation(this.$refs.cdWrapper, 'move', done)
        },
        afterEnter() {
            animations.unregisterAnimation('move')
            this.$refs.cdWrapper.style.animation = ''
        },
        leave(el, done) {
            this.$refs.cdWrapper.style.transition = 'all 0.4s'
            const { x, y, scale } = this._getPosAndScale()
            this.$refs.cdWrapper.style[transform] = `translate3d(${x}px,${y}px,0) scale(${scale})`
            this.$refs.cdWrapper.addEventListener('transitionend', done)
        },
        afterLeave() {
            this.$refs.cdWrapper.style.transition = ''
            this.$refs.cdWrapper.style[transform] = ''
        },
        togglePlaying() {
            if (!this.songReady) {
                return
            }
            this.setPlayingState(!this.playing)
            if (this.currentLyric) {
                this.currentLyric.togglePlay()
            }
        },
        end() {
            if (this.mode === playMode.loop) {
                this.loop()
            } else {
                this.next()
            }
        },
        loop() {
            this.$refs.audio.currentTime = 0
            this.$refs.audio.play()
            this.setPlayingState(true)
            if (this.currentLyric) {
                this.currentLyric.seek(0)
            }
        },
        next() {
            if (!this.songReady) {
                return
            }
            if (this.playlist.length === 1) {
                this.loop()
                return
            } else {
                let index = this.currentIndex + 1
                if (index === this.playlist.length) {
                    index = 0
                }
                this.setCurrentIndex(index)
                if (!this.playing) {
                    this.togglePlaying()
                    if (index === this.playlist.length) {
                        index = 0
                    }
                    this.setCurrentIndex(index)
                    if (!this.playing) {
                        this.togglePlaying()
                    }
                }
                this.songReady = false
            }
        },
        prev() {
            if (!this.songReady) {
                return
            }
            if (this.playlist.length === 1) {
                this.loop()
                return
            } else {
                let index = this.currentIndex - 1
                if (index === -1) {
                    index = this.playlist.length - 1
                }
                this.setCurrentIndex(index)
                if (!this.playing) {
                    this.togglePlaying()
                }
            }
            this.songReady = false
        },
        ready() {
            this.songReady = true
            this.savePlayHistory(this.currentSong)
        },
        error() {
            this.songReady = true
        },
        updateTime(e) {
            this.currentTime = e.target.currentTime
        },
        format(interval) {
            interval = interval | 0
            const minute = interval / 60 | 0
            const second = this._pad(interval % 60)
            return `${minute}:${second}`
        },
        onProgressBarChange(percent) {
            const currentTime = this.currentSong.duration * percent
            this.$refs.audio.currentTime = currentTime
            if (!this.playing) {
                this.togglePlaying()
            }
            if (this.currentLyric) {
                this.currentLyric.seek(currentTime * 1000)
            }
        },
        getLyric() {
            this.currentSong.getLyric().then((lyric) => {
                if (this.currentSong.lyric !== lyric) {
                    return
                }
                this.currentLyric = new Lyric(lyric, this.handleLyric)
                if (this.playing) {
                    this.currentLyric.play()
                }
            }).catch(() => {
                this.currentLyric = null
                this.playingLyric = ''
                this.currentLineNum = 0
            })
        },
        handleLyric({ lineNum, txt }) {
            this.currentLineNum = lineNum
            if (lineNum > 5) {
                let lineEl = this.$refs.lyricLine[lineNum - 5]
                this.$refs.lyricList.scrollToElement(lineEl, 1000)
            } else {
                this.$refs.lyricList.scrollTo(0, 0, 1000)
            }
            this.playingLyric = txt
        },
        showPlaylist() {
            this.$refs.playlist.show()
        },
        middleTouchStart(e) {
            this.touch.initiated = true
            // 用来判断是否是一次移动
            this.touch.moved = false
            const touch = e.touches[0]
            this.touch.startX = touch.pageX
            this.touch.startY = touch.pageY
        },
        middleTouchMove(e) {
            if (!this.touch.initiated) {
                return
            }
            const touch = e.touches[0]
            const deltaX = touch.pageX - this.touch.startX
            const deltaY = touch.pageY - this.touch.startY
            if (Math.abs(deltaY) > Math.abs(deltaX)) {
                return
            }
            if (!this.touch.moved) {
                this.touch.moved = true
            }
            const left = this.currentShow === 'cd' ? 0 : -window.innerWidth
            const offsetWidth = Math.min(0, Math.max(-window.innerWidth, left + deltaX))
            this.touch.percent = Math.abs(offsetWidth / window.innerWidth)
            this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
            this.$refs.lyricList.$el.style[transitionDuration] = 0
            this.$refs.middleL.style.opacity = 1 - this.touch.percent
            this.$refs.middleL.style[transitionDuration] = 0
        },
        middleTouchEnd() {
            if (!this.touch.moved) {
                return
            }
            let offsetWidth
            let opacity
            if (this.currentShow === 'cd') {
                if (this.touch.percent > 0.1) {
                    offsetWidth = -window.innerWidth
                    opacity = 0
                    this.currentShow = 'lyric'
                } else {
                    offsetWidth = 0
                    opacity = 1
                }
            } else {
                if (this.touch.percent < 0.9) {
                    offsetWidth = 0
                    this.currentShow = 'cd'
                    opacity = 1
                } else {
                    offsetWidth = -window.innerWidth
                    opacity = 0
                }
            }
            const time = 300
            this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
            this.$refs.lyricList.$el.style[transitionDuration] = `${time}ms`
            this.$refs.middleL.style.opacity = opacity
            this.$refs.middleL.style[transitionDuration] = `${time}ms`
            this.touch.initiated = false
        },
        _pad(num, n = 2) {
            let len = num.toString().length
            while (len < n) {
                num = '0' + num
                len++
            }
            return num
        },
        _getPosAndScale() {
            const targetWidth = 40
            const paddingLeft = 40
            const paddingBottom = 30
            const paddingTop = 80
            const width = window.innerWidth * 0.8
            const scale = targetWidth / width
            const x = -(window.innerWidth / 2 - paddingLeft)
            const y = window.innerHeight - paddingTop - width / 2 - paddingBottom
            return {
                x,
                y,
                scale
            }
        },
        ...mapMutations({
            setFullScreen: 'SET_FULL_SCREEN'
        }),
        ...mapActions([
            'savePlayHistory'
        ])
    },
    watch: {
        currentSong(newSong, oldSong) {
            if (!newSong.id) {
                return
            }
            if (newSong.id === oldSong.id) {
                return
            }
            if (this.currentLyric) {
                this.currentLyric.stop()
                this.currentTime = 0
                this.playingLyric = ''
                this.currentLineNum = 0
            }
            clearTimeout(this.timer)
            this.timer = setTimeout(() => {
                this.$refs.audio.play()
                this.getLyric()
            }, 1000)
        },
        playing(newPlaying) {
            const audio = this.$refs.audio
            this.$nextTick(() => {
                newPlaying ? audio.play() : audio.pause()
            })
        },
        fullScreen(newVal) {
            if (newVal) {
                setTimeout(() => {
                    this.$refs.lyricList.refresh()
                }, 20)
            }
        }
    },
    components: {
        ProgressBar,
        ProgressCircle,
        Scroll,
        Playlist
    }
}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
    @import "~common/stylus/variable"
    @import "~common/stylus/mixin"

    .player
        .normal-player
            position: fixed
            left: 0
            right: 0
            top: 0
            bottom: 0
            z-index: 150
            background: $color-background
            .background
                position: absolute
                left: 0
                top: 0
                width: 100%
                height: 100%
                z-index: -1
                opacity: 0.6
                filter: blur(20px)
            .top
                position: relative
                margin-bottom: 25px
            .back
                position absolute
                top: 0
                left: 6px
                z-index: 50
            .icon-back
                display: block
                padding: 9px
                font-size: $font-size-large-x
                color: $color-theme
                transform: rotate(-90deg)
            .title
                width: 70%
                margin: 0 auto
                line-height: 40px
                text-align: center
                no-wrap()
                font-size: $font-size-large
                color: $color-text
            .subtitle
                line-height: 20px
                text-align: center
                font-size: $font-size-medium
                color: $color-text
            .middle
                position: fixed
                width: 100%
                top: 80px
                bottom: 170px
                white-space: nowrap
                font-size: 0
            .middle-l
                display: inline-block
                vertical-align: top
                position: relative
                width: 100%
                height: 0
                padding-top: 80%
                .cd-wrapper
                    position: absolute
                    left: 10%
                    top: 0
                    width: 80%
                    height: 100%
                    .cd
                        width: 100%
                        height: 100%
                        box-sizing: border-box
                        border: 10px solid rgba(255, 255, 255, 0.1)
                        border-radius: 50%
                    &.play
                        animation: rotate 20s linear infinite
                    &.pause
                        animation-play-state: paused
                    .image
                        position: absolute
                        left: 0
                        top: 0
                        width: 100%
                        height: 100%
                        border-radius: 50%
                .playing-lyric-wrapper
                    width: 80%
                    margin: 30px auto 0 auto
                    overflow: hidden
                    text-align: center
                    .playing-lyric
                        height: 20px
                        line-height: 20px
                        font-size: $font-size-medium
                        color: $color-text-l
            .middle-r
                display: inline-block
                vertical-align: top
                width: 100%
                height: 100%
                overflow: hidden
            .lyric-wrapper
                width: 80%
                margin: 0 auto
                overflow: hidden
                text-align: center
                .text
                    line-height: 32px
                    color: $color-text-l
                    font-size: $font-size-medium
                &.current
                    color: $color-text
        .bottom
            position: absolute
            bottom: 50px
            width: 100%
            .dot-wrapper
                text-align: center
                font-size: 0
                .dot
                    display: inline-block
                    vertical-align: middle
                    margin: 0 4px
                    width: 8px
                    height: 8px
                    border-radius: 50%
                    background: $color-text-l
                &.active
                    width: 20px
                    border-radius: 5px
                    background: $color-text-ll
            .progress-wrapper
                display: flex
                align-items: center
                width: 80%
                margin: 0px auto
                padding: 10px 0
                .time
                    color: $color-text
                    font-size: $font-size-small
                    flex: 0 0 30px
                    line-height: 30px
                    width: 30px
                &.time-l
                    text-align: left
                &.time-r
                    text-align: right
            .progress-bar-wrapper
                flex: 1
            .operators
                display: flex
                align-items: center
                .icon
                    flex: 1
                    color: $color-theme
                &.disable
                    color: $color-theme-d
                    i
                        font-size: 30px
                .i-left
                    text-align: right
                .i-center
                    padding: 0 20px
                    text-align: center
                    i
                        font-size: 40px
                .i-right
                    text-align: left
                .icon-favorite
                    color: $color-sub-theme
        &.normal-enter-active, &.normal-leave-active
            transition: all 0.4s
            .top, .bottom
                transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
        &.normal-enter, &.normal-leave-to
            opacity: 0
            .top
                transform: translate3d(0, -100px, 0)
            .bottom
                transform: translate3d(0, 100px, 0)
        .mini-player
            display: flex
            align-items: center
            position: fixed
            left: 0
            bottom: 0
            z-index: 180
            width: 100%
            height: 60px
            background: $color-highlight-background
        &.mini-enter-active, &.mini-leave-active
            transition: all 0.4s
        &.mini-enter, &.mini-leave-to
            opacity: 0
        .icon
            flex: 0 0 40px
            width: 40px
            padding: 0 10px 0 20px
            img
                border-radius: 50%
            &.play
                animation: rotate 10s linear infinite
            &.pause
                animation-play-state: paused
        .text
            display: flex
            flex-direction: column
            justify-content: center
            flex: 1
            line-height: 20px
            overflow: hidden
            .name
                margin-bottom: 2px
                no-wrap()
                font-size: $font-size-medium
                color: $color-text
            .desc
                no-wrap()
                font-size: $font-size-small
                color: $color-text-d
        .control
            flex: 0 0 30px
            width: 30px
            padding: 0 10px
            .icon-play-mini, .icon-pause-mini, .icon-playlist
                font-size: 30px
                color: $color-theme-d
            .icon-mini
                font-size: 32px
                position: absolute
                left: 0
                top: 0

    @keyframes rotate
        0%
        transform: rotate(0)
        100%
        transform: rotate(360deg)
</style>